Groundwater Infiltration in Urban Sewer Systems
Summary
Urban sewer systems worldwide are subject to unwanted groundwater entering through defects such as cracks, joint failures and porous materials. This infiltration is driven by hydraulic head differences between subsurface water tables and sewer interiors, and it can vary seasonally with fluctuations in groundwater levels, rainfall and sea‐level changes. Uncontrolled groundwater infiltration exacerbates hydraulic loading, leading to sewer surcharge, overflows and increased treatment costs. Coastal and cold-climate cities face heightened vulnerability: sea-level rise elevates groundwater tables, while frost dynamics in cold regions induce transient infiltration during snowmelt. Monitoring and modelling approaches—including physically based numerical simulations, real-time flow calibration and tracer techniques—have advanced understanding of spatial and temporal patterns of infiltration. Integrated assessment of structural condition, climate impacts and sewer hydraulics is essential for prioritising rehabilitation and enhancing resilience of ageing infrastructure.
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Groundwater Infiltration in Urban Sewer Systems publication trend
The graph below shows the total number of articles in groundwater infiltration in urban sewer systems across all publications each year (not limited to Nature Index journals).
Technical terms
Groundwater infiltration: Unwanted entry of subsurface water into sewer conduits through defects in pipe walls or joints.
Vadose zone: The unsaturated subsurface layer above the water table where pores contain both air and water.
Phreatic zone: The saturated subsurface layer below the water table where pores are fully filled with water.
Stable water isotopes: Variants of water molecules used as tracers to differentiate between groundwater and other water sources in hydrological studies.
References
- Data-driven analysis and integrated modeling of climate change impacts on coastal groundwater and sanitary sewer infrastructure. Sustainable Cities and Society (2023).
- Global perspectives on groundwater infiltration to sewer networks: A threat to urban sustainability. Water Research (2024).
- Stable water isotopes as a tool for assessing groundwater infiltration in sewage networks in cold climate conditions. Journal of Environmental Management (2021).
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